نتایج جستجو برای: glacial
تعداد نتایج: 11388 فیلتر نتایج به سال:
The Tibetan Plateau is an essential source of water for Southeast Asia. The runoff from its∼ 34 000 glaciers, which occupy an area of ∼ 50 000 km2, feeds Tibetan lakes and major Asian rivers like the Indus and Brahmaputra. Reported glacial shrinkage likely has an impact on the runoff. Unfortunately, accurate quantification of glacial changes is difficult over the high-relief Tibetan Plateau. Ho...
Sognefjord is formed by a combination of exploitation of rock structure and subaerial and subglacial processes. The fjord system follows zones of rock-structural weakness. Above sea level the landforms are due mainly to subaerial processes, and somewhat surprisingly not to glacial activity. Removal of erosive products and deepening of the fjord below sea level is due to glacial erosion.
High-resolution records of glacial^interglacial variations in biogenic carbonate, opal, and detritus (derived from non-destructive core log measurements of density, P-wave velocity and color; rv 0.9) from 15 sediment sites in the eastern equatorial (sampling resolution is V1 kyr) clear response to eccentricity and precession forcing. For the Peru Basin, we generate a high-resolution (21 kyr inc...
[1] Runoff from mountain glaciers and icecaps is a critical control on physical and chemical conditions of aquatic ecosystems in glaciated watersheds. To date, there has been little research on the biogeochemistry of proglacial streams. Here we use a space for time substitution to evaluate how stream water physical conditions and concentrations of carbon, nitrogen, and phosphorus may be altered...
The canonical question of which physical, chemical or biological mechanisms were responsible for oceanic uptake of atmospheric CO2 during the last glacial is yet unanswered. Insight from paleo-proxies has led to a multitude of hypotheses but none so far have been convincingly supported in three dimensional numerical modelling experiments. The processes that influence the CO2 uptake and export p...
Aims & Backgrounds: The Quaternary period is considered as the interval of climatic oscillations (glacial and interglacial) coupled with tectonic episodes. Therefore, tectonics and climate have simultaneously governed the evolution of Quaternary alluvial fans. Unraveling the tectonic and climatic factors under varied depositional systems is therefore the fundamental issue in understanding the e...
Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Given the magnitude and dynamism of the deep marine carbon reservoir, it is almost certain that past glacial – interglacial fluctuations in atmospheric CO 2 have relied at least in part on changes in the carbon storage ...
The glacial-interglacial cycles of the upper Pleistocene have had a major impact on the recent evolutionary history of Arctic species. To assess the effects of these large-scale climatic fluctuations to a large, migratory Arctic mammal, we assessed the phylogeography of reindeer (Rangifer tarandus) as inferred from mitochondrial DNA (mtDNA) sequence variation in the control region. Phylogenetic...
Qu! ebec-Labrador, Canada, is one of the postulated dispersal centres of the Late Wisconsinan Laurentide Ice Sheet, and also contains an unusually complex and rich glacial geological record. A reliable reconstruction of glaciation history represented by this record would improve our comprehension of the dynamics of the eastern sector of the Laurentide Ice Sheet, such as the evolution of the bas...
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